The Siglent SDS 1104X-E does have the bode plot function (only in combination with Sigelent Generators).
News from Batronix/Rigol:
Batronix told me, the missing Hi-Res Mode on 5000/7000 is known and would be fixed, probably..
I also did a request by Rigol/Germany if there is a promotion offer planned for the 5000 just like by the 7000.
Today´s answer was no, there were no offers planned for the MSO 5000 series.
Anyway, I´ve ordered a MSO5074, should arrive in 2-3 days.
The option bundle will be ordered when I´m confident with the scope.